Sigmund Freud (1856-1939), Austrian neurologist and founder of psychoanalysis. His name is often used to refer to his theories about the unconscious mind, dream interpretation, and psychosexual development.
German surname, possibly derived from Middle High German 'vreude' meaning 'joy' or related to 'vride' meaning 'peace'. The name became synonymous with psychoanalytic theory through Sigmund Freud's revolutionary work in psychology.
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